Universal chuck.



G. 0. GRIDLEY.

UNIVERSAL CHUCK.

APPLICATION FILED we. 11. 1909.

Patented May 23, 1911.

aw dlqy 3% W7 .N xwe Q l\ m .Q II a Q a Q Q R flw Q GEORGE O. GRIIDLEY, OF WINDSOR, VERMONT.

UNIVERSAL CHUCK.

Specification of Letters I'atent.

Patented May 23, 1911.

Application filed August 27, 1909. Se "1211 No. 514,885.

To all whom it may concern:

Be it known that I, Geoncn GRIDLEY, of Windsor, in the county of W'mdsor and State of Vermont, have invented certaip new and useful Improvements in Universal Chucks, of which the following is a specification.

:This invention relates to a chuck for holding and rotating work'which is to be formed by turning.

The object is to enable a piece of work to be held with its axis making any desired angle (within reasonable limits) with the axis of rotation of the chuck in order that a warped or -crooked piece may be located as a whole approximately in coincidence with the axis of rotation of the chuck.

- In other words it is myobject to enable 'such a crooked or warped piece to be so held that in being turned down straight thestock -which is removed in thus turning the piece taken from the outerend of the piece.

from the end.

My object is to enable the stock removed in straightening the work in this manner to .be taken from the middle part or from the entire length of the piece instead of mainly Accordingly I have devised an adjustable member or collct for directly grasping the work which can be shifted so that its axis makes angles with the axis of the chuck as a whole in order that the center of the outer end of the work may be located on or near the axis of the chuck, or to set the work in such a way that the divergence thereof from a straight line may be located on opposite sides of the axis of the chuck ent preferred.

Figure 1 represents a longitudinal section of a chuck embodying the principles of my invention, showing a crooked work piece associated therewith, together with the female cente for locating the free end of the work. Fig. 2 is a cross-section of the same on the line 2 -2 of Fig. 1. Fig. 3 is a partial: section and partial end elevation of a bush. ing forming part of the device Fig. 4 is a partial longitudinal section and a partial side elevation of the same. Fig. 5 is anelevation of the angularly adjustable workclamping collet. Fig. 6 is an end elevation of he same. Fig. 7 is a partial cross-section and end elevation of the outer collet or clamping portion of the chuck.

The same reference characters indicate the same parts in all the figures.

Itcferring to the drawings, which, it should. be understood, are illustrative merely of one possible mode ofcarrying my invention into effect, the reference character 1 represents a work spindle which is adapted to be rotated and on the end of whichthe chuck is mounted.

2 represents a sleeve secured upon the 'en of the spindle, being preferably screwed thereupon and abutting against the collar 3. The outer-end of this sleeve is conical and has a tapered internal surface 4 which serves to force the work-clamping jaws inward into gripping relation with the work.

5 represents a spring collet or chuck of ordinary form consisting of a tubular men1-. her which is slotted at two or more points (designated by the numeral .6) through a,

portion of its length to form spring jaws. These jaws are designated by 7 and are externally tapered so as to bear against the internal tapered surface- 4 of the sleeve 2. lVhen this collct is moved axially in one direction the engagement of the jaws with the surface 4 crowds them inward to clamp the work, and when moved in the opposite direction, the the work.

8 is a longitudinally movable pusher tube for moving the collet in this manner.

10 is an inner collet which serves as the member for directly engaging the work. This collet is formed as a tube having longitudinal 'slots 11 which divide its outer end into a number of spring jaws. The inner end is made flaring at 12 in order to permit entrance into it of work fed through the spindle.

jaws spring outward and release 13 is a tube arranged centrally within the spindle for guiding the work into the collet 10. j

The jaw portions 14 of the collet 10 are longitudinally convex. eXternally,-that is they are formed as partsof a sphere; their outer surfaces constituting the equatorial zone of the sphere so as to serve as one member of a ball and socket joint. The other member of the joint consists of a bushing or socket member secured to the jaws oi the collet 5. This socket member is made of a ring which is divided into two or more parts whlch are connected by screws or other suitable fastening means 16 to separate jaws tweenjthe ends thereof.

7 of the collet 5. Thus the 15 are enabled to. move toward and from eachother with'the movements otthe jaws 7 to press upon. the jaws 14: of the collet 10. The lnner surface of the socket bushing is provided with a spherically concave groove which fits the spherical outer surface of the jaws 14. Thus the'collet 10 is adapted to be shifted'in any direction transverse to its axis within the limits of turningmovement al.- lowed by the shape of the col-let 10 as a whole, and in any such position-ithas a normal hearing on the socket member.

The=work is designated by 17 and in this case consists of a spindle or rod which is more'or less warped or bent out of a straight line, the amount ofdistortion thereof'being exaggerated for the purpose of illustration. When the collet 5 is "forced against the surface 4; of the sleeve 2, the jaws 7 are 'crowded'inward, bearing upon the jaws 14 ofthe inner collet and causing the latter-t0 grlp the 'work. By reason of the ball and socket connection between the outer and inner oollets, the latter may be located 'so' chuck.

I The dotted -line b-b is the centenline ofthe work. If a piece of work, of such a character as that here shown Weresecured 111 an ordinary chuck, its. free end would diverge widely from the axis of rotation and in turning down the work so as to be concentric with this axis the greater part of the stock removed would come from the outer s end, with the result that this end might finally be made too small.

My invention, having provisions forhold where between the ends.

parts of the ring.

ing the work at any angle with the axis of rotation, enables the center line of 'the work to coincide with or cross the axis of rotation at more than one point, either at the ends of the work or at a point located anymay be arranged so that its eccentricity or distortion lies on both sides of the axis of notation, and any part -of the length of the work may be madetheeccentric part thereof. Thereby the stock removed in turning down the work to concentric form maybe averaged or distributed over the work and the liability of making one end too small.

avoided.

This invention may be applied to any chuck where the work is intended to be fed from the rear through the spindle which carries the chuck orto be inserted through the front end. The invention mayalso be embodiedhin-a .varietyof difierent mechanical constructions, its essentials being found in any structure'having a gripping member which is capable of adjustment relatively to the chuck as a whole in such a way as to permit the angle between the center line of the work and the axis of rotation to be varied. I claim 1. A chuck comprising a work-gripping member having jaws formed with spherically curved outer surfaces, an outer set of internally concave jaws engaging the convex surfacesof. the first-named jaws and mov-- able radially withrespect to the axis of the chuck, and means for forcing the last-named jaws inward to crowd the work-gripping jaws against the WOI'k;

2. A chuck comprising a rotatable casing having a tapered surface, a set of outer jaws between which and the casing provision for relative axial movement is made said jaws being arranged to engage the tapered surface of said casing so as to be forced inward upon such relative movement in one direction, a divided internal sphericallycencave ring secured to the jaws,'- and a work -gripping member having jaws spherically convex externally and arranged to bear on the spherically concave inner surface of said ring, whereby the said work-gripping member may be adjusted 'angularly with respect to said outer jaws and at'the same time itsjaws may be operated by inward movement of the'outer jaws.

In testimony whereof I, have afiixed my signature, in presence of two witnesses.

- GEORGE O. GRIDLEY. Witnesses:

W. JfSAxm,

* RUTH P. KEYES.

Thus thework I 

